So when the team finally gets Matt and Allura meets him, she is super shook. She can't. Because Matt and Pidge look so alike, but Pidge is "this is a baby" adorable, whereas Matt is "I would thank you if you dated me" adorable. She can't fathom how this is possible. Shiro immediately recognizes the signs of such confoundment because once he remembered Matt he went through the same thing. He comforts her through this difficult time.